7 steps rising, 7 falling, 4 MHz.
Mh.. Try to set a trapezoidal wave on your AD2, even at the voltages more congenial to the device. Say 500 mV or 5 V.
Can you confirm that already at 2 MHz the wave is heavily distorted and at 5 MHz it's no longer distinguishable as a trapezoidal? Same at low frequencies, e.g. 100 Hz.
And that no matter the voltage.
Did the same with an external awg. Same results. It's the scope.
I'm starting wondering what exactly I can observe with it.
Not low level signals, OK. But not even high level ones, it seems.
In any case, thanks for the experiments you are performing
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